Waveguide antenna structure based on 77GHz millimeter wave radar
By designing a waveguide antenna structure based on 77GHz millimeter-wave radar, using a two-stage one-to-two waveguide power divider and an aluminum alloy horn radiation array element, the high loss, low gain and mutual coupling problems of existing antennas are solved, achieving the effects of low loss, high gain and good consistency.
Patent Information
- Application Number
- CN202422872943.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-25
AI Technical Summary
Existing 77GHz millimeter-wave radar antennas have problems such as high loss, low gain, poor pattern consistency, mutual coupling between antennas, and high cost.
It adopts a two-stage one-to-two waveguide power divider structure and four waveguide horn radiation array elements, combined with aluminum alloy waveguide horn radiation array elements and air cavity structure, using step matching and power distribution along the H-plane, and is designed as a waveguide antenna structure with low loss, high gain, wide beam and low sidelobe.
A waveguide antenna with low loss, high gain and good consistency is achieved, which reduces the mutual coupling between antennas and reduces costs.
Smart Images
Figure CN223427783U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of microwave antennas, and in particular to a waveguide antenna structure based on a 77GHz millimeter-wave radar. Background Art
[0002] With the rapid development of wireless communication technology, microwave antennas are increasingly being used in radar, communications, remote sensing, and other fields. High-precision applications such as automotive collision avoidance, weather monitoring, and satellite communications place even higher demands on microwave antenna performance. Millimeter-wave radar, as a high-precision detection technology, is valued for its high resolution and strong anti-interference capabilities. In millimeter-wave radar systems, waveguide antennas are a key component, and their performance directly impacts the overall performance of the radar system.
[0003] Currently, 77GHz millimeter wave radar antennas are usually in the form of microstrip antennas. However, this type of antenna has some disadvantages: first, microstrip antennas have high loss and low gain; second, their direction Figure One The antennas themselves are not uniform; furthermore, they are prone to mutual coupling. Furthermore, microstrip antennas require high-frequency substrates, which results in high costs. Therefore, there is an urgent need for an antenna design that ensures low loss and high gain while minimizing mutual coupling and ensuring good antenna uniformity. Utility Model Content
[0004] The purpose of the present utility model is to overcome the shortcomings of the above-mentioned prior art and provide a waveguide antenna structure with low loss, high gain, wide beam and low sidelobe, so as to meet the demand for high-performance waveguide antennas in the field of modern microwave antenna technology and a waveguide antenna structure based on 77GHz millimeter wave radar.
[0005] In order to achieve the above objectives, the waveguide antenna structure based on 77GHz millimeter wave radar of the present invention has the following structure:
[0006] The waveguide antenna structure based on the 77GHz millimeter-wave radar includes a two-stage one-to-two waveguide power divider structure and four waveguide horn radiation array elements connected to the waveguide power divider structure. The waveguide power divider structure also has an assembly for connecting to an external waveguide feeding component. The waveguide horn radiation array element is made of aluminum alloy, and the inside of its waveguide cavity is air.
[0007] In the waveguide antenna structure based on 77GHz millimeter wave radar, the assembly parts include positioning holes and threaded holes, and the positioning holes and threaded holes can be used to connect with the standard rectangular waveguide WR12 flange.
[0008] In the waveguide antenna structure based on the 77GHz millimeter wave radar, the threaded hole is an American-made M3 threaded hole.
[0009] In the waveguide antenna structure based on the 77GHz millimeter-wave radar, the impedance matching method of the two-stage one-to-two waveguide power divider structure is step matching, with two-stage step matching at the position close to the assembly part and one-stage step matching at the position close to the waveguide horn radiation array element.
[0010] In the waveguide antenna structure based on the 77GHz millimeter wave radar, each step-matched step corner has a cut angle.
[0011] In the waveguide antenna structure based on the 77GHz millimeter wave radar, the one-to-two waveguide power divider structure has a power distribution structure along the H-plane.
[0012] In the waveguide antenna structure based on the 77GHz millimeter wave radar, the two-stage one-to-two waveguide power divider structure has an impedance matching structure connected by spacers, and the spacers all have cut angles.
[0013] In the waveguide antenna structure based on the 77GHz millimeter wave radar, the four waveguide horn radiation array elements have four pyramidal horn openings, and each of the pyramidal horn openings has a cut angle extending along the electric field direction.
[0014] In the waveguide antenna structure based on the 77GHz millimeter wave radar, each of the pyramidal horns is fixedly arranged on a boss.
[0015] This utility model utilizes a waveguide antenna structure for 77GHz millimeter-wave radar. It comprises a two-stage, one-to-two waveguide power splitter structure and four waveguide horn radiating elements connected to the waveguide power splitter. The waveguide power splitter also includes an assembly for connecting to an external waveguide feed assembly. The waveguide horn radiating elements are made of aluminum alloy, and their waveguide cavities are filled with air. This provides a waveguide antenna structure with low loss, high gain, wide beamwidth, and low sidelobes, meeting the demand for high-performance waveguide antennas in modern microwave antenna technology. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a front view of the waveguide antenna structure based on 77GHz millimeter wave radar of the present invention;
[0017] Figure 2 This is a top view of the waveguide antenna structure based on 77GHz millimeter wave radar of the present invention;
[0018] Figure 3 This is a side view of the waveguide antenna structure based on 77GHz millimeter wave radar of the present invention.
[0019] Reference numerals:
[0020] Waveguide power divider structure 1, waveguide horn radiation array element 2, threaded hole 3, positioning hole 4, spacer 5, two-stage step matching 6, one-stage step matching 7, pyramid horn mouth 8, boss 9. DETAILED DESCRIPTION
[0021] In order to more clearly understand the technical content of the present invention, the following embodiments are given to explain in detail.
[0022] like Figure 1 、 Figure 2 、 Figure 3 The figure shows a waveguide antenna structure based on a 77GHz millimeter-wave radar, comprising a two-stage waveguide power splitter structure 1 and four waveguide horn radiation array elements 2 connected to the waveguide power splitter structure 1. In order to connect to other waveguide feed components (not shown in the figure), the waveguide power splitter structure 1 also has an assembly for connecting to an external waveguide feed component. The assembly is a positioning hole 4 and a threaded hole 3 that can be connected to a standard rectangular waveguide WR12 flange. The threaded hole is an American M3 threaded hole, with a diameter of 2.5mm for the threaded hole 3 and a diameter of 1.7mm for the positioning hole 4. The centers of the threaded hole 3 and the positioning hole 4 are both located on a circumference with a diameter of 14.29mm. The waveguide horn radiation array element 2 is made of aluminum alloy, specifically aluminum alloy 6061. The interior of the waveguide cavity is air, and the internal dimensions of the waveguide cavity are 3mm*1.5mm.
[0023] In a preferred embodiment, Figure 3 As shown, the impedance matching method of the two-stage one-to-two waveguide power divider structure 1 is step matching. Near the assembly part, there are two-stage step matching 6, where the length of the first stage matching is 1.6mm and the height is 0.75mm. The length of the second stage step is 1mm and the height is 0.75mm, and the total height of the two stages is 1.5mm. A single-stage step matching 7 is used near the waveguide horn radiation array element, and the step size is 0.5mm*1.5mm. For ease of processing, all step corners are chamfered with a chamfer radius of 0.5mm. The step corners of each step matching are chamfered with a chamfer radius of 0.5mm.
[0024] In a further preferred embodiment, Figure 2 As shown, the one-to-two waveguide power splitter structure 1 has a power distribution structure along the H-plane. Compared with the E-plane power distribution model, the power distribution structure along the H-plane is smaller in size and more conducive to miniaturization.
[0025] In a further preferred embodiment, Figure 2As shown, the two-stage one-to-two waveguide power splitter structure 1 has an impedance matching structure connected by spacers 5, and each of the spacers 5 has a cut corner. The spacers of the first-stage one-to-two power splitter have dimensions of 1.9mm*0.5mm, and the spacers of the second-stage one-to-two power splitter have dimensions of 2.6mm*0.55mm. All spacers 5 have a cut corner radius of 0.5mm.
[0026] In a more preferred embodiment, Figure 1 and Figure 3 As shown, the four waveguide horn radiation array elements have four pyramid horn mouths 8, each of which has a cut angle extending along the electric field direction, and the cut angle radius is 0.5mm. Each of the pyramid horn mouths 8 is fixedly set on a boss 9. The boss 9 can be a rectangular platform. Figure 1 The size of the rectangular platform shown is 14mm*5mm, and the height of the rectangular platform is 1mm.
[0027] In the application of the present invention, a two-stage one-to-two waveguide power divider structure and four waveguide horn radiation array elements connected to the waveguide power divider structure ensure that the mutual coupling between antennas is small and the antennas have good consistency.
[0028] The use of mounting components connected to external waveguide feed components, specifically positioning holes and threaded holes for connection to standard rectangular waveguide WR12 flanges, enhances installation convenience and product versatility. Furthermore, the impedance matching method of the two-stage one-to-two waveguide power splitter structure is stepped matching, ensuring low loss and high gain. The power distribution structure along the H-plane achieves a smaller size, further facilitating miniaturization and expanding its application scenarios.
[0029] This utility model utilizes a waveguide antenna structure for 77GHz millimeter-wave radar. It comprises a two-stage, one-to-two waveguide power splitter structure and four waveguide horn radiating elements connected to the waveguide power splitter. The waveguide power splitter also includes an assembly for connecting to an external waveguide feed assembly. The waveguide horn radiating elements are made of aluminum alloy, and their waveguide cavities are filled with air. This provides a waveguide antenna structure with low loss, high gain, wide beamwidth, and low sidelobes, meeting the demand for high-performance waveguide antennas in modern microwave antenna technology.
[0030] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Accordingly, the specification and drawings are to be regarded as illustrative rather than restrictive.
Claims
1. A waveguide antenna structure based on 77GHz millimeter wave radar, characterized in that: It includes a two-stage one-to-two waveguide power divider structure and four waveguide horn radiation array elements connected to the waveguide power divider structure. The waveguide power divider structure also has an assembly for connecting to an external waveguide feeding component. The waveguide horn radiation array element is made of aluminum alloy, and the inside of its waveguide cavity is air.
2. The waveguide antenna structure based on 77GHz millimeter wave radar according to claim 1, characterized in that: The assembly includes a positioning hole and a threaded hole, and the positioning hole and the threaded hole can be used to connect with a standard rectangular waveguide WR12 flange.
3. The waveguide antenna structure based on 77GHz millimeter wave radar according to claim 2, characterized in that: The threaded hole is an American M3 threaded hole.
4. The waveguide antenna structure based on 77GHz millimeter wave radar according to claim 1, characterized in that: The impedance matching method of the two-stage one-to-two waveguide power divider structure is step matching, with two-stage step matching at the position close to the assembly part and one-stage step matching at the position close to the waveguide speaker radiation array element.
5. The waveguide antenna structure based on 77GHz millimeter wave radar according to claim 4, characterized in that: The step corners where the steps match each other have cut corners.
6. The waveguide antenna structure based on 77GHz millimeter wave radar according to claim 1, characterized in that: The one-to-two waveguide power divider structure has a power distribution structure along the H-plane.
7. The waveguide antenna structure based on 77 GHz millimeter wave radar according to claim 6, characterized in that: The two-stage one-to-two waveguide power divider structure has an impedance matching structure connected by spacers, and the spacers all have cut angles.
8. The waveguide antenna structure based on 77 GHz millimeter wave radar according to claim 1, characterized in that: The four waveguide horn radiation array elements have four pyramidal horn openings, and each of the pyramidal horn openings has a cut angle extending along the electric field direction.
9. The waveguide antenna structure based on 77 GHz millimeter wave radar according to claim 8, characterized in that: Each of the pyramid horns is fixedly arranged on a boss.